Winding Method Using Air Expansion Structure

ABSTRACT

Disclosed is a winding method using an air expansion structure, which accurately controls the winding process by preset inflation parameter values and preset winding parameter values, so as to create space for a membrane to contract after winding, that is, to relieve the stress of the membrane, so as to avoid the situation of deviation or innermost side wrinkling during winding of the membrane, and the rewinding procedure is not needed, so that the complexity of the working procedure is reduced.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from the Chinese patent application 202210320208.6 filed Mar. 29, 2022, the content of which are incorporated herein in the entirety by reference.

TECHNICAL FIELD

The present disclosure relates to a winding method, in particular to a winding method using an air expansion structure.

BACKGROUND

Generally speaking, when a membrane is wound, problems such as deviation and innermost side wrinkling are likely to occur due to the influence of stress. Therefore, before leaving the factory, the membrane must be rewound by a reel, and in the rewinding process, steps such as cold rolling, oven ironing and cold rolling setting need to be performed on the edge-shrunk membrane. However, this method is complicated and quite time-consuming.

Therefore, how to reduce the complexity of the process while avoiding the deviation or innermost side wrinkling during membrane winding is an urgent problem to be solved in this field.

SUMMARY

The purpose of the present disclosure is to provide a winding method using an air expansion structure, which can further achieve the best stress release space during membrane winding through a preset inflation parameter value and a preset winding parameter value, so as to realize the winding flatness of the membrane without a rewinding procedure, so as to reduce the complexity of working procedures.

In order to achieve the above purpose, the present disclosure provides a winding method using an air expansion structure, which includes the following steps:

-   -   arranging an air expansion structure on a winding device;     -   setting a preset inflation parameter value at the winding device         to input a gas to inflate the air expansion structure, so that a         sleeve arranged on the air expansion structure is expanded to a         first preset diameter;     -   arranging a membrane on the sleeve;     -   setting a preset winding parameter value at the winding device         for winding, so that the membrane is wound; and     -   removing the gas from the air expansion structure to contract         the sleeve to a second preset diameter;     -   wherein, a distance is generated between the sleeve and the         membrane.

More preferably, the preset inflation parameter value is 1.0-5.0 kg/cm².

More preferably, the preset inflation parameter value is 1.0-3.5 kg/cm².

More preferably, the preset inflation parameter value is 2.2-2.5 kg/cm².

More preferably, the first preset diameter is 660-691 mm, and the second preset diameter is 650-655 mm.

More preferably, the preset winding parameter value includes a tension parameter, which includes a winding tension, and the winding tension is 0.1-0.7 kg·m/s².

More preferably, the winding tension is 0.15-0.60 kg·m/s².

More preferably, the winding tension is 0.18-0.22 kg·m/s².

More preferably, the tension parameter includes an unwinding tension, and the unwinding tension is 0.6-1.2 kg·m/s².

More preferably, the preset winding parameter value includes a stress value of the coated membrane, and the stress value of the coated membrane is 11.8-37.2 N.

More preferably, the stress value of the coated membrane is 23.8-27.2 N.

More preferably, the preset winding parameter value includes a temperature parameter, which includes an oven temperature and a winding temperature, and the oven temperature is 45-85° C.

More preferably, the air expansion structure includes:

-   -   a shaft;     -   an airbag, arranged at one side of the shaft, wherein the airbag         expands or contracts when a gas is input or removed;     -   a link structure, including a first column, a second column, a         plurality of first fixing blocks, a plurality of second fixing         blocks and a link, wherein the first column and the second         column are arranged adjacent to each other, the first fixing         blocks are arranged on the first column, the second fixing         blocks are arranged on the second column, and the link is         connected with the first fixing blocks and the second fixing         blocks, so that the first column and the second column are         arranged in a ring shape to be annularly arranged outside the         airbag so as to define the airbag; and     -   a plurality of expansion shaft plates, wherein each expansion         shaft plate is connected with the link structure by a connector,         and one side of the expansion shaft plates is arranged between         the first column and the second column, so that the expansion         shaft plates are pushed due to the expansion of the airbag or         restored to the original position due to the contraction of the         airbag.

More preferably, the air expansion structure includes a first cover and a second cover, wherein the first cover is arranged at one end of the link structure, and the second cover is arranged at the other end of the link structure so as to fix the link structure.

More preferably, the connector is a pull rod or a spring.

More preferably, the connector penetrates through the side of the expansion shaft plates, and is connected between the first column and the second column; when the airbag expands, the expansion shaft plates are pushed to a position by the connector, and when the airbag contracts, the expansion shaft plates are restored to the original position from the position by the connector.

More preferably, the cross section of the expansion shaft plate presents a T-shaped structure, and the side of the expansion shaft plates through which the connector penetrates is a protruding side, while the other side of the expansion shaft plates is of an arc-shaped structure.

More preferably, the number of the expansion shaft plates is 6 to 15.

The present disclosure has the beneficial effects that the preset inflation parameter value and the preset winding parameter value are set to accurately control the winding process, thereby creating the space for the membrane to contract after winding so as to further solve the internal stress problem, at this time, the internal stress of the membrane is released, so that the rewinding procedure can be omitted, and the complexity of the working procedure is greatly reduced, and the cutting procedure can be directly performed after coating, thereby shortening the process time.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a flowchart of a method according to an embodiment of the present disclosure;

FIG. 2 is a side view of an air expansion structure according to an embodiment of the present disclosure before expanding;

FIG. 3 is a side view of an air expansion structure according to an embodiment of the present disclosure after expanding;

FIG. 4 is a side view when an air expansion structure is adopted for winding according to an embodiment of the present disclosure;

FIG. 5 is a side view after winding is completed according to an embodiment of the present disclosure;

FIG. 6A shows the situation of Embodiment 1 of the present disclosure at different winding tensions;

FIG. 6B shows the situation of Embodiment 2 of the present disclosure at different winding tensions;

FIG. 6C shows the situation of Embodiment 3 of the present disclosure at different winding tensions;

FIG. 7A shows the situation of Embodiment 4 of the present disclosure at different preset inflation parameter values;

FIG. 7B shows the situation of Embodiment 5 of the present disclosure at different preset inflation parameter values;

FIG. 7C shows the situation of Embodiment 6 of the present disclosure at different preset inflation parameter values;

FIG. 8 is a schematic diagram of a device according to an embodiment of the present disclosure:

FIG. 9 is a schematic exploded view of a device according to an embodiment of the present disclosure; and

FIG. 10 is a local schematic diagram of a device according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

In order to make the above and/or other objectives, functions and features of the present disclosure more obvious and understandable, a detailed description of preferred embodiments will be specially made below:

-   -   please refer to FIG. 1 , which is a flowchart of a method         according to an embodiment of the present disclosure. As shown         in the figure, a winding method using an air expansion structure         of the present disclosure includes the following steps:     -   S1, arranging an air expansion structure on a winding device;     -   S2, setting a preset inflation parameter value at the winding         device to input a gas to inflate the air expansion structure, so         that a sleeve arranged on the air expansion structure is         expanded to a first preset diameter;     -   S3, arranging a membrane on the sleeve;     -   S4, setting a preset winding parameter value at the winding         device for winding, so that the membrane is wound; and     -   S5, removing the gas from the air expansion structure, so that         the sleeve is contracted to a second preset diameter.

As shown in S1, the air expansion structure T is arranged on the winding device 5 for winding.

As shown in S2, the preset inflation parameter value is set at the winding device 5, and the corresponding quantity of gas can be input. Please also refer to FIGS. 2-3 , which are a side view of the air expansion structure according to an embodiment of the present disclosure before expanding and a side view of the air expansion structure after expanding, respectively, as shown in the figures. An airbag 2 of the air expansion structure T is inflated to make the airbag 2 expand, and the sleeve 6 sleeving the air expansion structure T is expanded to a first preset diameter, wherein the preset inflation parameter value is 1.0-5.0 kg/cm². When the preset inflation parameter value is too low, the membrane M will not have proper release space after the gas is removed, that is, stress cannot be effectively relieved. On the contrary, when the preset inflation parameter value is too high, the membrane M will be uneven in end face or unwound after the gas is removed, that is, too much stress causes too much release space, so that the membrane M cannot be effectively wound. Therefore, preferably, the preset inflation parameter value is 1.0-3.5 kg/cm², more preferably, the preset inflation parameter value is 2.2-2.5 kg/cm². The first preset diameter is 660-691 mm, and the first preset diameter is the diameter of the sleeve 6 after being expanded, and will be changed according to the preset inflation parameter value, but is not limited thereto.

As shown in S3, please also refer to FIG. 4 , which is a side view when an air expansion structure is adopted for winding according to an embodiment of the present disclosure, as shown in the figure. The membrane M is arranged on the expanded sleeve 6 for winding. Generally speaking, the membrane M to be produced is stuck to the sleeve 6 by fixing glue, but is not limited thereto.

As shown in S4, the preset winding parameter value is set at the winding device 5 for winding the membrane M, wherein the preset winding parameter value includes a tension parameter, a stress value of the coated membrane and a temperature parameter, the tension parameter includes unwinding tension and winding tension, the unwinding tension is 0.6-1.2 kg·m/s², and the winding tension is 0.1-0.7 kg·m/s². The size of the winding tension will affect the winding effect of the membrane M, so that the problem that the end face of the wound membrane M is uneven or deviated is caused. When the winding tension is too small, the end face may deviate. On the contrary, when the winding tension is too large, the surface of the membrane M may be obviously uneven, and the stress of the membrane M cannot be relieved. Therefore, preferably, the winding tension is 0.15-0.60 kg·m/s², and more preferably, the winding tension is 0.18-0.22 kg·m/s², and the stress value of the coated membrane is 11.8-37.2 N. and more preferably, the stress value of the coated membrane is 23.8-27.2 N, but is not limited thereto.

The temperature parameter includes oven temperature and winding temperature. The oven temperature is 45-85° C. The reason for setting the oven temperature is that the membrane M will be coated with corresponding materials according to requirements before winding, so the coated membrane M will be dried in the oven, and the temperature will also directly affect the winding status of the membrane M. If the temperature is too low, the situation that the material with which the membrane M is coated cannot be dried may be caused. Conversely, if the temperature is too high, the membrane M may wrinkle, but is not limited thereto.

In one embodiment, the preset winding parameter value further includes production speed, wherein the production speed is 25-45 m/min, but is not limited thereto.

As shown in S5, please also refer to FIG. 5 , which is a side view after winding is completed according to an embodiment of the present disclosure, as shown in the figure. After the membrane M is wound, the air expansion structure T will remove the originally input gas, so that the sleeve 6 will be contracted to a second preset diameter, wherein the second preset diameter is 650-655 mm, and the second preset diameter is the original diameter of the sleeve 6. In this way, there will be a distance S between the membrane M and the sleeve 6, which means that the stress of the membrane M will be relieved.

In one embodiment, the effects of different winding tensions are compared, wherein preset inflation parameter values and preset winding parameter values are shown in Table 1.

TABLE 1 Preset inflation parameter values and preset winding parameter values Preset inflation Stress of Tension kg · m/s² Oven Production parameter coated Unwinding Coated Winding temperature speed value membrane Item tension tension tension ° C. m/min kg/cm² N Embodiment 0.9 1.2 0.10-0.14 65 35 2.2-2.5 23.0-26.7 1 Embodiment 0.9 1.2 0.15-0.60 65 35 2.2-2.5 23.8-27.2 2 Embodiment 0.9 1.2 0.61-0.70 65 35 2.2-2.5 24.3-30.0 3

Please also refer to FIGS. 6A-6C, which respectively show the situations of Embodiments 1-3 of the present disclosure at different winding tensions, as shown in the figures.

In Embodiment 1, the air pressure of the air expansion structure T is 2.2-2.5 kg/cm², the winding tension is 0.10-0.14 kg·m/s² and the stress value of the coated membrane is 23.0-26.7 N. After the air pressure of the air expansion structure T is removed, the stress of the membrane M is 0 N, and the membrane M is likely to deviate during winding, as shown in FIG. 6A.

In Embodiment 2, the air pressure of the air expansion structure T is 2.2-2.5 kg/cm² the winding tension is 0.15-0.60 kg·m/s², and the stress value of the coated membrane is 23.8-27.2 N. After the air pressure of the air expansion structure T is removed, the stress of the membrane M is 0 N, the best winding tension is exhibited, and the end face and membrane surface of the membrane M are flat, so that the membrane M has good stress release space, as shown in FIG. 6B.

In Embodiment 3, the air pressure of the air expansion structure T is 2.2-2.5 kg/cm², the winding tension is 0.61-0.70 kg·m/s², and the stress value of the coated membrane is 24.3-30.0 N. After the air pressure of the air expansion structure T is removed, the stress of the membrane M is 0 N, since the winding tension is too large, although the end face of the membrane M is flat, the surface of the membrane M is obviously uneven, and there is no stress release space in the roll, as shown in FIG. 6C.

In another embodiment, the air pressure effects of different air expansion structures are compared, wherein the preset inflation parameter values and preset winding parameter values are shown in Table 2.

TABLE 2 Preset inflation parameter values and preset winding parameter values Preset inflation Stress of Tension kg · m/s² Oven Production parameter coated Unwinding Coated winding temperature speed value membrane Item tension tension tension ° C. m/min kg/cm² N Embodiment 0.9 1.2 0.18-0.22 65 35 1.0-2.1 11.8-23.2 4 Embodiment 0.9 1.2 0.18-0.22 65 35 2.2-2.5 23.8-27.2 5 Embodiment 0.9 1.2 0.18-0.22 65 35 2.6-3.5 27.5-37.2 6

Please also refer to FIGS. 7A-7C, which respectively show the situations of Embodiments 4-6 of the present disclosure at different preset inflation parameter values, as shown in the figures.

In Embodiment 4, the air pressure of the air expansion structure T is 1.0-2.1 kg/cm², the winding tension is 0.18-0.22 kg·m/s², and the stress value of the coated membrane is 11.8-23.2 N. After the air pressure of the air expansion structure T is removed, the stress of the membrane M is 0 N, and after the air expansion is deflated after winding, the expansion and contraction of the sleeve 6 are insufficient, so that the stress release space is limited, and the stress-relieved membrane M can be obtained only after a long time of stress release, as shown in FIG. 7A.

In Embodiment 5, the air pressure of the air expansion structure T is 2.2-2.5 kg/cm², the winding tension is 0.18-0.22 kg·m/s², and the stress value of the coated membrane is 23.8-27.2 N. After the air pressure of the air expansion structure T is removed, the stress of the membrane M is 0 N. and after the air expansion is deflated after winding, the end face of the membrane M is flat, and the stress release space in the roll is the best, as shown in FIG. 7B.

In Embodiment 6, the air pressure of the air expansion structure T is 2.6-3.5 kg/cm², the winding tension is 0.18-0.22 kg·m/s², and the stress value of the coated membrane is 27.5-37.2 N. After the air pressure of the air expansion structure T is removed, the stress of the membrane M is 0 N, and after the air expansion is deflated after winding, the stress release space in the roll is increased and is sufficient, so the stress is fully released, but there are risks of uneven end face and unwinding, as shown in FIG. 7C.

In one embodiment, please refer to FIGS. 8-10 , which are a schematic diagram of a device, a schematic exploded view of a device and a local schematic diagram of a device according to an embodiment of the present disclosure, respectively, as shown in the figures. Specifically, the air expansion structure T of the present disclosure includes a shaft 1, an airbag 2, a link structure 3 and expansion shaft plates 4, and after the air expansion structure T is arranged at a winding device 5, the shaft of the air expansion structure T can rotate around the winding device. The airbag 2 is arranged around the shaft, so that the airbag 2 can expand or contract evenly integrally when gas is input into or removed from the airbag 2. The link structure 3 is arranged outside the airbag 2 so as to define the position of the airbag 2 to prevent the airbag 2 from being displaced during expansion or contraction. The expansion shaft plates 4 are arranged on the link structure 3 at intervals, and are pushed to a position due to the expansion of the airbag 2 or restored to the original position from the position by the contraction of the airbag 2. At the same time, a sleeve 6 will sleeve the air expansion structure T for winding the membrane M, wherein the membrane M is a separator, such as an oily coated lithium battery separator, and the membrane M has a thickness of 5 μm-21 μm, a length of 1000 m-4000 m and a width of 500 mm-1200 mm, but is not limited thereto. The air expansion structure T and the sleeve 6 with different sizes may also be set according to the size requirements of the membrane M.

In one embodiment, the link structure 3 includes a first column 31, a second column 32, a plurality of first fixing blocks 33, a plurality of second fixing blocks 34 and link pieces 35, the number of the first columns 31 and the second columns 32 is not limited. In this embodiment, the total number of the first columns 31 and the second columns 32 is 12, and the first columns 31 and the second columns 32 are mainly used to support and link the airbag 2 and the shaft 1, so that the airbag 2 can be better wrapped around and fixed to the shaft 1.

Therefore, the first column 31 and the second column 32 are arranged adjacent to each other, the plurality of first fixing blocks 33 are arranged on the first column 31, and the number of the first fixing blocks 33 is not limited. In one embodiment, each first column 31 may be provided with 4-6 first fixing blocks 33, and the spacing between adjacent first fixing blocks 33 can be adjusted as required, but is not limited thereto. Similarly, a plurality of first fixing blocks 33 may be arranged on the second column 32, and the number of the second fixing blocks 34 is not limited either. In one embodiment, each second column 32 may be provided with 4-6 second fixing blocks 34, and the spacing between adjacent second fixing blocks 34 can be adjusted as required. Each first fixing block 33 and each second fixing block 34 are correspondingly arranged adjacent to each other, and each first fixing block 33 and each second fixing block 34 are connected by a link piece 35, in such a way, the first columns 31 and the second columns 32 can be arranged in a ring shape so as to be annularly arranged outside the airbag 2, so as to define the position of the airbag 2 to prevent the airbag 2 from being displaced during expansion or contraction.

The plurality of expansion shaft plates 4 are each connected with the link structure 3 by a connector 41, wherein the connector 41 is a pull rod or a spring, as long as the expansion shaft plates 4 can be moved to the position and the expansion shaft plates 4 moved to the position can be restored to the original position. In one embodiment, the cross section of the expansion shaft plate 4 presents a T-shaped structure, so one side of the expansion shaft plate 4 is a protruding side, and the opposite other side is of an arc-shaped structure. The protruding side of the expansion shaft plate 4 is arranged between the first column 31 and the second column 32, and the connector 41 penetrates through the protruding side and is connected with the first column 31 and the second column 32, so that when the expansion shaft plates 4 are pushed due to the expansion of the airbag 2, the expansion shaft plates 4 are pushed to a position by the connectors 41 or restored to the original position due to the contraction of the airbag 2, the expansion shaft plates 4 are restored to the original position from the position by the connectors 41. Even if the expansion shaft plates 4 are restored to their original positions, the number of the expansion shaft plates 4 is related to the average stress. In one embodiment, the number of the expansion shaft plates 4 is 6 to 15, preferably, the number of the expansion shaft plates 4 is 12, but is not limited thereto.

To sum up, the present disclosure takes the preset inflation parameter value and the preset winding parameter value for winding, so that the air expansion structure can spread the sleeve evenly and wind according to these parameter values, so as to achieve the effect of relieving the stress of the membrane, so that the beneficial effects of shortening the process time and reducing the complexity of the working procedure can be achieved, thus meeting the purpose of the present disclosure.

However, the above embodiments are only preferred embodiments of the present disclosure, and cannot be used to limit the patent protection scope of the present disclosure; so all simple equivalent changes and modifications made according to the patent protection scope and the content of the description still fall within the patent protection scope of the present disclosure. 

What is claimed is:
 1. A winding method using an air expansion structure, comprising the following steps: arranging an air expansion structure on a winding device; setting a preset inflation parameter value at the winding device to input a gas to inflate the air expansion structure, so that a sleeve arranged on the air expansion structure is expanded to a first preset diameter, arranging a membrane on the sleeve; setting a preset winding parameter value at the winding device for winding, so that the membrane is wound; and removing the gas from the air expansion structure to contract the sleeve to a second preset diameter, wherein, a distance is generated between the sleeve and the membrane.
 2. The winding method using an air expansion structure according to claim 1, wherein the preset inflation parameter value is 1.0-5.0 kg/cm².
 3. The winding method using an air expansion structure according to claim 1, wherein the preset inflation parameter value is 1.0-3.5 kg/cm².
 4. The winding method using an air expansion structure according to claim 1, wherein the preset inflation parameter value is 2.2-2.5 kg/cm².
 5. The winding method using an air expansion structure according to claim 1, wherein the first preset diameter is 660-691 mm, and the second preset diameter is 650-655 mm.
 6. The winding method using an air expansion structure according to claim 1, wherein the preset winding parameter value comprises a tension parameter, which comprises a winding tension, and the winding tension is 0.1-0.7 kg·m/s².
 7. The winding method using an air expansion structure according to claim 6, wherein the winding tension is 0.15-0.60 kg·m/s².
 8. The winding method using an air expansion structure according to claim 6, wherein the winding tension is 0.18-0.22 kg·m/s².
 9. The winding method using an air expansion structure according to claim 6, wherein the tension parameter comprises an unwinding tension, and the unwinding tension is 0.6-1.2 kg·m/s².
 10. The winding method using an air expansion structure according to claim 1, wherein the preset winding parameter value comprises a stress value of the coated membrane, and the stress value of the coated membrane is 11.8-37.2 N.
 11. The winding method using an air expansion structure according to claim 10, wherein the stress value of the coated membrane is 23.8-27.2 N.
 12. The winding method using an air expansion structure according to claim 1, wherein the preset winding parameter value comprises a temperature parameter, which comprises an oven temperature and a winding temperature, and the oven temperature is 45-85° C.
 13. The winding method using an air expansion structure according to claim 1, wherein the air expansion structure comprises: a shaft; an airbag, arranged at one side of the shaft, wherein the airbag expands or contracts when a gas is input or removed; a link structure, comprising a first column, a second column, a plurality of first fixing blocks, a plurality of second fixing blocks and a link, wherein the first column and the second column are arranged adjacent to each other, the first fixing blocks are arranged on the first column, the second fixing blocks are arranged on the second column, and the link is connected with the first fixing blocks and the second fixing blocks, so that the first column and the second column are arranged in a ring shape to be annularly arranged outside the airbag so as to define the airbag; and a plurality of expansion shaft plates, wherein each expansion shaft plate is connected with the link structure by a connector, and one side of the expansion shaft plates is arranged between the first column and the second column, so that the expansion shaft plates are pushed due to the expansion of the airbag or restored to an original position due to the contraction of the airbag.
 14. The winding method using an air expansion structure according to claim 13, wherein the air expansion structure comprises a first cover and a second cover, the first cover is arranged at one end of the link structure, and the second cover is arranged at the other end of the link structure so as to fix the link structure.
 15. The winding method using an air expansion structure according to claim 13, wherein the connector is a pull rod or a spring.
 16. The winding method using an air expansion structure according to claim 13, wherein the connector penetrates the side of the expansion shaft plates, and is connected between the first column and the second column; when the airbag expands, the expansion shaft plates are pushed to a position by the connector, and when the airbag contracts, the expansion shaft plates are restored to an original position from the position by the connector.
 17. The winding method using an air expansion structure according to claim 13, wherein a cross section of the expansion shaft plate presents a T-shaped structure, and the side of the expansion shaft plates through which the connector penetrates is a protruding side, while the other side of the expansion shaft plates is of an arc-shaped structure.
 18. The winding method using an air expansion structure according to claim 13, wherein the number of the expansion shaft plates is 6 to
 15. 